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Class 12 Physics
Ray Optics Instruments And Optical Chapter 9
Quiz 1
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A convex and a concave mirror of radii 10 cm each are facing each other and 15 cm apart. A point object is placed midway between them. Then position of the final image if the reflection first takes place at the concave mirror and then in the convex mirror is
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at the pole of the concave mirror
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at the pole of the convex mirror
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5 cm behind the convex mirror
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coincident with the object itself
When the object is located at the F of a concave mirror then
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Image is of same size
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image will be formed at infinity
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Image is reduced in size
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Image is magnified
The focal length of a convex lens (refractive index = 1.5) in air is 20 cm. When immersed in water (refractive index = 1.33), its focal length will be
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20.2cm
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78.23 cm
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7.23 cm
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2.02 cm
In Concave Mirror
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Reflecting surface is towards the centre of the sphere of which it can be considered as a cut off portion.
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Reflecting surface is on the opposite side of the centre of the sphere of which it can be considered as a cut off portion.
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Both a and b.
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Concave mirror does not exist.
In mirrors how can we differentiate real image from the virtual image
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Virtual image is always inverted whereas real is erect.
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Real image is always inverted whereas virtual image is erect.
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Real image is always twice in size as compared to virtual.
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Real and virtual both are same.
______ mirror is called as diverging mirror
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Concave
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Plane
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Convex
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Both b and c
Newtonian reflecting type telescope uses
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Concave mirror
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Convex lens
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Concave lens
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Convex mirror
According to the mirror formula
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A
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B
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C
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D
In a concave mirror when the object is located beyond C the magnification is
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More than 1
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Equal to 1
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Less than 1
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Both a and b
An image is upright and reduced in size. Which mirror is used to form such an image?
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Convex
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Concave
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Plane
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Both a and c
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